Creaking will be from metal on metal contact with no barrier between. So likely point will be the spring to spring seats is fairly common and as mentioned swift sells plastic washers to help isolate. Another area is the top hat to car body, if you payed attention to the oem when you removed it there were paper gaskets on top of the oem hats. I didn't replace mine and have a slight bit of creaking on my powertrix but only going over speed bumps and since there isn't a plastic washer for the rear spring seat (none big enough so I may make my own later but haven't bothered) they make a little noise too so I didn't bother ordering new gaskets. If you want it truly quiet you'll need to eliminate all metal to metal contact points.
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